Computer occassionaly freezes after being idle for a while

[kinaav]

I have a problem somewhat boring when I leave my PC idle beyond ten minutes, Vista crashes, the hard disk does not rotate any more, I can not do anything but shut it down brutally. It is a Toshiba P200 satelllite. For what ever reason but it is really very annoying when i get busy with a call for about ten minutes it gets freezes and then i had to restart it manually after getting this problem
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